This week, these five stocks have the best ratings in Earnings Revisions, one of the eight Fundamental Categories on Portfolio Grader.

Douglas Dynamics, Inc. (PLOW) designs, makes, and sells snow and ice control equipment for light trucks. The company also gets A’s in earnings revisions. For more information, get Portfolio Grader’s complete analysis of PLOW stock.

Tata Motors Limited Sponsored ADR (TTM) designs, manufactures, and sells automotive vehicles and parts. The company also gets A’s in earnings revisions and earnings surprise. For more information, get Portfolio Grader’s complete analysis of TTM stock.

Bio-Techne Corporation (TECH) develops, manufactures, and sells biotechnology products and hematology calibrators and controls. For more information, get Portfolio Grader’s complete analysis of TECH stock.

Silicon Laboratories Inc. (SLAB) designs and develops proprietary, analog-intensive and mixed-signal integrated circuits that can be used in a range of applications. The company also gets A’s in operating margin growth, earnings growth, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of SLAB stock.

Aspen Technology, Inc. (AZPN) is a global provider of mission-critical process optimization software solutions, which are designed to manage and optimize plant and process design, operational performance, and supply chain planning. The company also gets A’s in earnings surprise. For more information, get Portfolio Grader’s complete analysis of AZPN stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.